Auroral NO+ 4.3 μm emission observed from the Midcourse Space Experiment: Multiplatform observations of 9 February 1997

Details Auroral NO+ 4.3 μm emission observed from the Midcourse Space Experiment: Multiplatform observations of 9 February 1997 Auroral NO+ 4.3 μm emission observed from the Midcourse Space Experiment: Multiplatform observations of 9 February 1997

Jun 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007jgra..11206327o&link_type=abstract

Journal of Geophysical Research, Volume 112, Issue A6, CiteID A06327

Physics

2

Atmospheric Composition And Structure: Airglow And Aurora, Atmospheric Composition And Structure: Thermosphere: Composition And Chemistry, Ionosphere: Auroral Ionosphere (2704), Ionosphere: Ion Chemistry And Composition (0335), Magnetospheric Physics: Auroral Phenomena (2407)

Scientific paper

The Spatial Infrared Imaging Telescope III (SPIRIT III) radiometer on the Midcourse Space Experiment satellite (MSX), observed enhanced 4.3 μm emission from a very well characterized aurora over the Barents Sea on 9 February 1997, in conjunction with observations by the POLAR and FAST satellites, the Loparskaya ground site, and ultraviolet and visible spectrometers aboard MSX. Measurements of the auroral location, form, spatial extent and dosing conditions were applied to specify the component of auroral 4.3 μm radiance due to the slowly produced and optically thick CO2 ν 3 (001-000) transition. An analysis based on the Auroral Atmospheric Radiance Code (AARC) indicates: (1) the emission originates near and beyond the tangent point; (2) the optically thick CO2 ν 3 radiation is largely self absorbed by the intervening atmosphere; and (3) the auroral enhancement is predominantly due to NO+ Δv = 1 vibrational state transitions. In addition, the analysis indicates that the previously reported laboratory result for the NO+ v >= 1 vibrational yield from the reaction, N+ + O2, is insufficient to account for the observed 4.3 μm emission. In order to explain the current results, we propose that there is additional production from the reaction, N2 + + O, forming NO+ in vibrational levels 0, 1, and 2 with relative populations of approximately 0.25, 0.5, and 0.25, respectively. The combined production processes yield an energetic electron induced efficiency of 0.56 +/- 0.18 photons per auroral ion pair for NO+ Δv = 1 emission at altitudes equal to or greater than 112 km.

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